Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
Atlantic Ocean.
Underseaboats.U-boats
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German U-Boats are submarines. In World War 2, the Germans used these submarines to attack in groups of three or more. The Germans called these groups of submarines "wolfpacks". The Americans, British & Canadians also used the name "wolfpack" to refer to a group of German U-Boats.
Submarines, commerce raiding.
U-boats. (German submarines)
Oilers then merchantmen.
The name U-boat was applied to German submarines.
The submarines were either called "submarines" or "U-boats." The German submarine was called the "U-boat"
'U-boats' was the name given to German submarines in both the first and second world war.
They're german submarines, used in world war 1 and world war 2